Blast-pipe connection.



A. J. BOHENER.

BLAST PIPE CONNECTION.

APPLICATION FILED umso. 1916.

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-BLAST PIPE CONNECTION.

APPLICATION HLED 05030. |916,

Patented June 19, 1917.

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A A. 1. BORENER. BLAST PIPE CONNECTION.

APPLICATION mio 050.30, 1916.

Patented June 19, 1917.

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A. J. BORENER. BLAST PIPE coNNEcnoN.

APPLICATION FILED DEC.30. 1916.

Patented June 19, EN?.

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UNITED sTATEs PATENT EErcE.

ALBERT J'. BOIRENER,4 0F CHICAGO, ILLINOIS.r

'BLAST-PIPE CONNECTION.

T 0 all whom it may concern:

Be it known that I, ALBERT .I. BORENER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blast-Pipe Connections, of which the following is a specication. Y

This invention relates to the airblast for oil burning furnaces and has for its object y the provisionof means whereby explosions,

due to leaking of the oil into the blast pipe j when the furnace is in use, will be prevented.

A further object of the invention is to jpro- I vide a novel construction whereby the oil spreader or tip of the burnertube may be withdrawn without requiring disconnection of the airblast terminal from the furnace, and a still further object of the invention is to provide means whereby any gasV which 7 may be generated from the admission of oil before the air blast is started will'be vented and turned aside from a path whichwould take it through the air'blast conduit.

The several stated objects of the invention Tand other incidental objects which will ap- -pear as the description of the same proceeds are attained in such mechanism as is illustrated in the accompanying drawingsy and the invention resides in certain novel features which will be particularly pointed out in the claimsfollowing the description.

In the drawings:

Figure 1 is an endv elevationof a rivetheating furnace having my improvements applied thereto; f

Fig. 2 is a view partly in plan and partly in horizontal section of the furnaceand air feeding mechanism illustrated in Fig. 1,

Fig. 3 is a detail longitudinal vertical secvtion of the same;

i VYtion through the return :bend ofthe goose? Fig. 4 is an enlarged lhorizontal'sectioin through the wind gate shown in Figs. 1, 2, andS- f Fig' is an enlargedlongitudinal. secneck or blast pipe;

Fig. 6 is a'longitudinal section showing a modication of the invention;

Fig. 7 is a detail end' elevation of the arrangement shown in Fig. 6

Fig. 8 is a detail planvview of the windgate employed in the arrangements shown in Figs. 6 and 7. Y v

The rivet-heating furnace 1 may be of any well-knownv type and is providedwith' i Specification of Letters Patent.

Patented June 19, 1917.

Application filed December 30, 1916. Serial No. 139,898.

a combustion chamber or fire-box 14, oil beingsupplied to said chamber through an oil feed pipe 2 provided with a cut-ofi valve 3 whereby the flow of oil may be regulated, and air being supplied to the said chamber through an air blast pipe or conduit 4 which communicates with the chamber around the extremity of the oil supply pipe and also through a passage 16 formed in the wall of the furnace and opening into. the upper portion of the fire chamber 14. The air blast pipe or conduit may be formed Aof sheet metal or other material and may lead tothe furnace from any convenient fan or other form of blast-creating mechanism. The conduit will generally rise through the Hoor of the furnace room, as shown in Fig. 1- and is deflected laterally, as indicated at 4, below the cut-off valve 3. The portion 4 of the air blast pipe extends generally upwardly and communicates directly with the upper' portion 5` which forms the return bend or apex of a goose-neck structure.

' The terminal l5 of the return bend 5 is disserted through and engages in thebottom wall'of the air blast conduit and directly receives the lterminal of the'oil pipe 17. In the lower end of the saidburner tube is a drip valve 22 which may be opened to test the iiow. of the oil and determine whether it is sufficient'to' operate the furnace. Y Inthe upper end of this burner tube 20 is a tip or spreader 23 which is adjustably 4secured within the burner tubelby a set screw 24 and has an annular fiangeor lateral enlargement 25 bywhich the oil passing from the burner tube will be deflected or spread so that it will be taken up by the air flo-wing past the same and thoroughly vaporized so that it.

will burn in the well-kn0wn manner. It is to be noted that the tip or spreader 23 has a stem fitting within the bore of the burner tube and the set screw 24 is mounted in the wall of the said tube and bears upon the stem kso as to secure it in its adjusted position. Groovesare provided in the illustrated embodiment of the invention to permit fiow of the oil between the stem and the wall of the burner tube, and the flange 25 will be spaced a greater or less distance from the extremity of the burner tube according to the adjustment of Qthe tip. The external diameter of the enlarged threaded portion 21 will be equal to or greater than the diameter of the tip or upper portion of the burner tube with the set screw 24: therein so that the burner tube may be withdrawn from the air blast pipe without requiring the removal of the air blast pipe from the furnace.

A branch 6 leads laterally from the air blast conduit and extends to one side of the furnace whence it is carried around the furnace as shown clearly in F ig. 2, being provided with perforations 26 adjacent the openings 27 in the walls of the furnace so that the flame will be held within the furnace and the operator protected from injury.

Means are provided for regulating the force of the air current within the air conduit 18 and also within the branch 6, said means consisting of a wind-gate or valve which may be easily set to cut off part or all of the air blast as occasion may demand. The form of wind-gate employed to regulate the flow through the branch 18 is shown most clearly in Fig. 3 and consists of a semicylindrical body 9 fitted within a casing 7 and provided with a handle 10 extending through a horizontal slot 8 in the said casing 7. The inner face of the gate 9 is curved downwardly and toward the space between the side edges 28 of the wind-gate so that when the device is in the position shown in Fig. 3, the air flowing downwardly through the terminal portion 15 of the air blast pipe will be deflected by the concave surface 29 into the passages 16 and 18 instead of being abruptly checked and forming eddies which will retard its flow and detract from its efficiency. The handle member 10 plays in the slot 8 so that the wind-gate or valve may be turned to bring its outer solid side across the bore of the outlet portion 30 of the casing 7 f and thereby prevent the How of air to the passages 16 and 18, as will be readily understood. The casing 7 is fitted within the terminal member 15 of the air blast pipe and is secured in any desired manner to the conduit 18. A drip-hole 11 is formed in the bottom or floor of the casing 7 So that when the furnace is not in operation, any oil which may leal; from the burner will be permitted to escape and will not flow into the blast pipe. It wvill also be noted that the terminal member of the blast pipe extends vertically downward to the wind-gate and, therefore, does not provide an outlet through which the oil may gravitate so that the flow ofl the o il into the blast pipe is eifectually preyented and explosions, dueto oil accumulating in the blast pipe, are obviated. The

wind-gate in the branch blast pipe 6 is located preferably at the junction of that portion of the pipe which extends around the sides of the furnace and that portion which leads upwardly and laterally from the main blast pipe. Vhile the form of windgate shown in Fig. 3 could be employed, it will generally be found more convenient to employ the form shown in Figs. 2 and 8, in which two similar plates 31 having mating recessed portions in their 'opposed faces are bolted together and tted to and between the members of the pipe. lVithin the opposed recessed faces of theseplates, the gate or valve 32, consisting of an imperforate plate, is slidably mounted. It will be noted that the plates 31 are provided with forwardly projecting longitudinal arms 33 and'that a handle 3a projects forwardly from the plate 32 between the said arms and is constructed with a terminal eye 35 or other form of handle.

For the successful operation of oil-,burning blast furnaces, it is necessary that the air blast be set up before the oil is ignited. If it be attempted to light the oil before the air blast is running, gas is generated which tends to flow back through the blast pipe and great damage has been done by explosions due to this generation and escape of gas. My invention contemplates the provision of means for venting such gas and preventing its back iow through the blast pipe by providing means which-may be disposed across the bore ofthe blast pipe when the furnace is not in operation and which will be automatically removed from such position by the pressure of the air blast and locked in position to permit the flow of the air. In thedrawings, I have illustrated a damper 12 which is hinged at one edge to the upper wall of the return portionv of the blast pipe and is adapted to fit within an opening formed in the said pipe when it is desired to have the air blast operate. Mating lugs 13 are provided on the damper and the blast pipe to receive a locking pin 42 by which the damper may be held in its raised position.v On the inner side of the damper, near the free edge of the same is a guide or lug- 36 which supports a hook 37 pivoted at its uppeil end to the short arm of an angle lever 38 which is fulcrumed upon a lug 39 projecting from the'damper at about the center of .Vhen the blast is shut off, the angle lever 38 vdrops by gravity and is thereby swung 'blast pipe 46 and about its fulcrum. This movementY of the lever causes its shorter arm to push upon thel ldotted lines. An opening is consequently left in the air blast pipe andthe damper extends across the bore of the same so as to block it. Therefore, if gas should be generated in the lire chamber of the furnace and flow back through the air passages, such gas would be deflected by the damper out through the damper-openingin the blastpipe and escape without doing any damage. When the air blast is again turned into the air blast pipe, the pressure of the blast upon the damper will swing it upwardly to the position shown in full lines and in such movement the bill of the hook or latch will ride under the eye 40 but the momentum acquired by the angle lever will swing it toward the latch and, consequently, the short arm of said lever will pull the latch into engagement with the eye 40 so that the damper will be locked in its upper position and an unobstructed passage provided for the air blast.

Should an accident or other cause so damage the damper that it fails to work automatically, the pin 42 is inserted through the mating lugs 13 to hold the damper raised until the damage can be repaired.

In Figs. 6 and 7 I have shown the invention applied to a plate-heatingfurnace 45 into which the air is delivered through a a branch sleeve 47 leading from the terminal of the goose-neck portion 48 of the blast pipe. The branch 47 opens directly into a sleeve 49 which leads into the lire chamber of the furnace and in the outer wall of the said branch 47 is fitted a plug or block 50' the external ydiameter of which is at least equal to the external diameter of the spreader 51. The oil is supplied through a pipe 52 leading through the cut-0E valve 53 to the'burner tube or pipe 54 which extends through the plug 50 and centrally through the spreader 51. In this form, thevspreader consists ofv a plurality of obliquely disposed wings or plates 55 extending from a central sleeve or hub 56 which is tted upon the burner tube or pipe 54, the air blast striking these wings being deflected so that it will have a whirling or rotating action at the end of the burner tube and will, consequently mingle with the oil and thoroughly vaporize thev same. A damper 57, corresponding in all `respects to the'damper 12, will be provided in the blast pipe and a wind-gate will also `be provided in said pipe but in this form of the invention the wind-gate will consist of horizontal plates 58, corresponding in all respects to the plates 31 previously described, and in which will be slidably mounted a cut-off having a handle 59, said cutoff corresponding in construction to the cutolf 32. A drip opening 60 is provided in the lower wall of the branch 47 to permit the escape of anyy oil.which may tend to leak from the burner when the burner is not in operation.

From the foregoing description, taken in connection with the accompanying drawings, it will be seen that I have provided an exceedingly simple and efficient mechanism whereby the leakage of oil or backflow of gas into the blast pipe will-be prevented. Attention is particularly invited to the fact that in both forms of the invention the blast pipe leads downwardly to the point where the oil is discharged, although the air blast at said point flows around and past the emission ports of the burner.` The blast pipe may be disposed below the floor of the furnace room, as is now the general custom, so that the application of my improvements to existing furnaces will not create obstructions to the free passage of the workmen, nor involve any loss of overhead space nor any obscuring of the natural light of the room.

Having thus described the invention, what is claimed as new is:

1. The combination with a furnace, of an air conduit having a goose-neck section immediately adjacent the furnace and leading into the combustion chamber of the furnace, and an automatic 'damper hinged within the apex of said goose-neck section and adapted 100 to be automatically secured in its raised position.

2. The combination with an oil-burning furnace, of a blast pipe having a downwardly extending terminal, a branch leading from said terminal into the furnace, a wind-gate consisting of a semi-cylindrical body mounted within the terminal adjacent the said branch, the inner surface of the said wind-gate being curved downward and toward its -side edges, and means for rotatably shifting said gate.

3. In an apparatus for the purpose set forth, the combination of a blast pipe having an opening in its upper wall, a damper hinged to said pipe at one edge of said opening andadapted to close the same, a latch mounted on the inner side of said damper, and means on the pipe to be engaged by said latch whereby to hold the 'damper in 120 its raised position.

4. In an apparatus for `the purpose set i forth, the combination of a blast pipe having a feed opening in one wall, a damper hinged to the pipe adjacent said opening, a keeper on the wall of the pipe adjacent said opening, an angle lever fulcrumed upon the inner side of said damper, and a latch pivoted to said lever and adapted to engage said keeper.

5. In au apparatus for the purpose set 6. In an apparatus for the purpose set forth7 the combination of a blast pipe, a forth7 the combination With a blast pipe, of 10 damper s wingingly mounted inthe pipe and means for opening` a vent in said pipe and adapted to extend across the same whereby closing the bore of the same, said means beit Will be exposed to the air blast and may ing operable by the air blast to Close the vent be swungby the same to its closed position, and open the bore of the pipe. and means on the damper for locking it in In testimony whereof I aiiix my signature. 15 its Closed position. ALBERT J. BORENER. [Ls] Qopis of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Y Y Washington, D. C. 

